Here is a “planker” aka “scrub” that I just built as an add on the to chain harrow I am pulling with my steers. I had some 2×6 (true) boards of funky redwood which made a nice little scrub. It is about 3’6″ wide and 32″ deep, six planks joined by some 2×2 bolts and screws. It took me about 30 minutes to make.